| 摘要 |
PURPOSE:To reduce the man-hours under management and assembling man-hours by a method wherein rotatable clearances are set to be made between a first and a second hinge parts due to the respective shrinkages of the first hinge part and of the second hinge part after molding. CONSTITUTION:First, a first hinge 19 is inserted in the recessed parts 21a and 22a of the molding top force 21 and of the molding bottom force 22 of a second molding tool 20. Secondly, thermoplastic synthetic liquid with a melting point lower than that of the first hinge 19 such as polypropylene resin or the like is injected in a hollow space 24 of the recessed parts 21a and 22a and solidified so as to form a second hinge 28 consisting of second hinge parts 25, each of which formed in such a manner as to surround an exposed hinge pin 15, and a second plate part 27 having fitting holes 25 thereon. Rotatable clearances 29 are made between a first and a second hinge parts 16 and 25 due to the thermal shrinkage of synthetic resin developed by a natural setting after molding. In addition, clearances 30 are generated around the hinge pins 15 so as to similarly make the second hinge 28 rotatable about the hinge pins. |
